Apparatus for heating liquids



No. 621,03I. Patented Mar. l4, I899.

A. w. & L w. CASE. APPARATUS FOR HEATING LIQUIDS.

, (Application filed Jan. 27, 1898 (No Model.) 2 Shests-Sheet l.

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No. 621,03l. Patented fl lar. l4, I899. A. W. 8. L. W. CASE.

APPARATUS FOR HEATING LIQUIDS.

(Application filed Jan. 27, 1898.) (No Model.) 2 Sheets-Sheet 2.

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ALFRED wELLs CASE AND P TENT FEICE.

LAWRENCE W. CAsE, OF HIGHLAND PARK,

CONNECTICUT.

APPARATUS FOR HEATING LIQUIDS.

SPECIFICATION forming part of Letters Patent No. 621,031, dated March 14, 1899.

Application filed January 27,1898; serial No. 668 234. on) model.)

To all whom it may concern:

Be it known that we, ALFRED WEL s CAsE and LAWRENCE W. OAsE, citizens of the United States, and residents of Highland Park, county of Hartford, and State of Connecticut, have invented certain new and useful Improvements in Apparatus for Heat- To this end our invention consists in the combination of means to the stated end, as hereinafter described, and more particularly recited in the claims.

Referring to the drawings, Figure l is a view of our improved apparatus with parts cut away in section to illustrate the construction. Fig. 2 is a plan view of our improved apparatus. Fig. 3 is a detail View of a modified form of device for applying additional heat.

In the accompanying drawings the letter 0. denotes a supply-pipe through which water flows under sufficient pressure into the apparatus to cause it to rise through the heat-transferrer b into the heating-chamber c.

The heat-transferrer 1) comprises an outer casing d, an inner cylinder 6, between the walls of which a space is formed within which between it and the adjacent walls within the greater part of the length of the heat-transferrer. The object of this construction is to cause inflowing water to pass through the transferrer in coils and in continuous contact with the walls of the supply-pipe, so that the heat in the outgoing water may be transferred by conduction to the inflowin g water, and thus cause the latter to be delivered into the heating-chamber c at a temperature nearly equal to that at which water flows out from the chamber 0. The inner cylinder e is supported within the coils of the supply-pipe in the transferrerb in any convenient manner. After passin g through this heat-transferrer b the supplypipe it delivers into the bottom of the heating chamber through a valve 71.. In the form described the heat-transferrer b is arranged in an upright position, and the heating-chamber c is placed above it. Within the heatingchamber 0 is a regulator-valve i, which in the form shown consists of a hollow vessel open at the top and located within guide-supports, which serve to maintain it in an upright and central position in the chamber.

The guide-supports in the form shown consist of the coil is of the steam-pipe it, this coil being arranged Within the chamber 0 near its outer wall. A discharge-pipe Zextends from a point where its open end is located within the regulator-valve 11 out through the mouth of the latter and through the wall of the heating-chamber to the cover of the heat-transferrer b through a hole in which it enters, so that water may flow through this pipe Z from the heating-chamber 0 into the transferrer b.

The water withinthe heating-chamber c is raised to the boiling-point as by means of steam flowing into the coil is and the delivery of hot water into the chamber 0 from the end of the coil which opens into the chamber 0. A factor in raising the water in this heatingchamber is the steam flowing through the pipe is, and the rate of flow of the steam and water of condensation is regulated by the valve located in the pipe at a point outside of the wall of the chamber and between the coil and the point 10 where the hot water of condensation is discharged into the water near the bottom of the heating-chamber 0. Instead of discharging into the chamber the pipe at the end of the coil may be connected with any desired storage vessel for distilled water.

The water after having been discharged into the heat-transferrer I) through the pipe Z flows'in a spiral path around and in close contact with the coils of the supply-pipe and by conduction transfers its heat to the inflowing water. The water reaching the bottom of the shell of the transferrer goes through the pipe Z and discharges at Z into a reservoir 0, this reservoir having a discharge-pipep, provided with a valvep, which controls the outflow of purified water. Within this reservoir is a float g, which is connected, as by means of a lever a, with the valve k The float may also be connected by suitable mechanism with means for controlling the flame m, (when this form of heating device is used in place of the steam-coil,) so that the position of the float will control the degree of extra heat supplied to the heating-chamber.

The pipe Z bends at a point above the level of the heating-chamber, so as to prevent the siphoning over of water through the discharge pipe Z after the flow begins. The height of this bend in the pipe Z above the level of the heating-chamber determines the degree of back pressure of the column of water upon the outflowing stream from the heating-chamber. The boiling-point of water Varies with the degree of pressure upon its surface, and by regulating this pressure the comparative temperature of the outflowin g water may be controlled. The greater the back pressure the greater the heat applied and carried 0%. To prevent the apparatus from becoming air-bound, the heating chamber is provided with an air-valve o and the pipe Z with a similar valve 0 at the highest point of the bend.

The supply-pipe a is provided with a suit able filter a and the discharge-pipe Z with a suitable filter a in order to remove from the water impurities held in mechanical suspensron.

The operation of the device is as follows: The several parts of the apparatus being arranged in the relative positions shown,water is allowed to flow into the heating-chamber and fill the system. Heat is then applied through the coil (or the flame m) until the water begins to flow through the dischargepipe 1, the transferrer b, and the pipe Z into the reservoir 0. The rate of flow is determined by the position of the regulator-valve i, which in its lowermost position closes the opening at the valve h, so as to prevent the inflow of water, but when lifted therefrom, as by the buoyancy of the vessel due to the discharge of water therefrom, again opens the valve for the water to flow into the chamber. If the discharge has been too rapid, it is controlled by the position of the float q in-the reservoir 0, the raising of the water-level in the reservoir shutting the valve 70* or turning down the flame 'm.

The regulator-valve, as stated, is a hollow vessel open at the top in order to permit water to flow into it over its upper edge and when filled sinking, so as to close the valve h; but when the discharge of water from the body of the hollow vessel increases its buoyancy it rises, so as to open the valve h and permit a further flow of water into the heating-chamber. The movements of this regulator-valve are gradual and not abrupt, and while the device is in operation for heating Water the valve h is open to a degree for a greater part of the time. The rising-andfalling movements and the opening and closing of the valve h are automatic, and by the described method a practically continued flowing of water through the apparatus is obtained.

The apparatus is maintained in working condition and in operation by the very slight expenditure of heat applied to the heating chamber, this extra heat imparted to the water within the heating-chamber being practically wholly saved by its transference to the inflowing supply of cold water to the system.

In the within-described apparatus a feature of our invention is that additional heat is applied to all of the liquid treated in the heating-chamber, and a further feature and advantage are that the liquid passes in at the bottom,where the temperature is the lowest, and flows over the upper edge of the hollow valvebody, where the temperature is thehighest, and into this hollow body of the valve before discharging, so that none of the liquid can pass out Without having been subjected to the highest temperature Within the heating-chamher. This insures a thorough heating of the liquid to such degree as may be necessary to the treatment of a liquid, as Water, for sani tary purposes.

We claim as our invention- 1. In combination in an apparatus for heating liquids, a heat-transferrer including an outer casing and an inner cylinder, passages for the flow of liquid toward and from the heating-chamber, one of said passages c011- sisting of a coil closely fitting in a lateral direction the space between said casing and cylinder, and the other passage consisting of the space formed between the successive turns of said coil, a heating-chamber, and a regula tor-valve located in the heating-chamber whereby the flow of liquid therethrough is controlled by the changes of temperature in the chamber, all substantially as described.

2. In a liquid-heating apparatus in combination, a heattransferrer comprising alternate contiguous passages located between the inner and outer Walls of an annular chamber that form a portion of the walls of one of said passages, a heating-chamber, tubular connections between the heating-chamber and the channels in the transferrer, a current-regulator located within the heating-chamber, means for imparting added heat to the contents of the heating-chamber, a reservoir and means depending on the level of the water in the reservoir for controlling the degree of additional heatapplied to the heating-chamber, all substantially as described.

3. In combination in an apparatus forheatlit) ing liquids, a heat-transferrer having alternate contiguous passages for the flow of liquid toward and from a heating-chamber, a heating-chamber, a regulator-valve in said chamber with a body open at its top, a discharge= pipe extending into the valve-body, a reservoir, a float located in the reservoir and means connecting said float with a device for controlling the heat-supply to the heating-chamber, all substantially as described.

at. In combination in an apparatus for heating liquids, a heat-transferrer including an outer casin g and an inner cylinder with an annular space therebetween, inlet and outlet passages for the flow of liquid toward and from a heating-chamber, one of said passages consisting of a coil closely fitting in a lateral direction the annular space between said casing and cylinder and the opposite passage being formed between the successive turns in said coil, a heating-chamber located above the heat-transferrer, means for imparting additional heat to allthe liquid entering the heating-chamber, and means for regulating the flow of liquid through said chamber, all substantially as described.

5. In combination in an apparatus for heating liquids, a heat-transferrer having sepa rate contiguous passages for the flow of liquid toward and from a heating-chamber, a heating-chamber located above the heat-trans= ferrer, means for imparting additional heat to all the liquid entering the heating-chain ber, means for regulating the flow of liquid through the said chamber, a discharge-pipe extending from the heating-chamber to the transferrer and a discharge-pipe extending from the transferrer to a reservoir and hav ing a bend in said discharge-pipe located at a level above the highest point of the discharge-pipe which extends from the heatingchamloer to the transferrer, all substantially as described.

ALFRED WELLS CASE.

LAWRENCE W. CASE.

Witnesses:

CHAS. L. BURDETT,

ARTHUR B. JENKINS. 

